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How to define two different critical opening displacements for normal and shear directions in cohesive material properties?

Palm_Tree
Cohes3
marc
I am trying to define bilinear traction-separation properties for interface elements. The first picture above is taken from Marc-Mentat 2021.1.
 
In the first picture Marc prompts to enter cohesive energy, critical opening displacement and max. opening displ. for normal direction (if I am correct). Then shear/normal coefficients are entered to allow Marc to calculate traction-separation properties in shear direction. The thing that I couldn't understand is how Marc calculates the critical opening displacement in shear direction? If I am not wrong, Marc should ask a third coefficient for calculating critical opening disp. in shear direction.
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    Dear Zhong Qin,
     
    Thank you very much for your reply. Considering your example I am not sure how to calculate critical opening distance. I think max. separation distance can be calculated by keeping the area under the triangle same but it looks like critical separation distance is an independent variable. I have drawn possible curves of traction-separation curve in shear direction which you can find below. Most probably I am missing something simple.
     
    Traction-Sep
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  • 0
    Dear Zhong Qin,
     
    Thank you very much for your reply. Considering your example I am not sure how to calculate critical opening distance. I think max. separation distance can be calculated by keeping the area under the triangle same but it looks like critical separation distance is an independent variable. I have drawn possible curves of traction-separation curve in shear direction which you can find below. Most probably I am missing something simple.
     
    Traction-Sep
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